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-rw-r--r--src/RobinBoundary.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/RobinBoundary.c b/src/RobinBoundary.c
index 9e3bb7b..c40e155 100644
--- a/src/RobinBoundary.c
+++ b/src/RobinBoundary.c
@@ -14,6 +14,7 @@
@@*/
#include <math.h>
+#include <stdio.h>
#include <stdlib.h>
#include <string.h>